Java Process waitFor() 方法

2024 年 11 月 2 日 | 阅读时长 2 分钟

Process 类的 waitFor() 方法用于等待当前执行线程，直到由 Process 对象执行的进程完成。当子进程终止时，该方法会立即返回，如果子进程未终止，线程将被阻塞。

语法

参数

不适用

此方法通常返回进程和子进程的退出值。默认情况下，正常终止由 0 表示。

示例 1

public class Process_waitForMethodExample1 {
    public static void main(String[] args) {
        try {
            // creating a new process.
            System.out.println("Ms Paint will run.");
            Process p = Runtime.getRuntime().exec("mspaint.exe");
            // waits for the process until you terminate.
            p.waitFor();
            // when you manually close Ms Paint.exe program will continue here
            System.out.println("You have exited from Ms paint.");
        } catch (Exception ex) {
            System.out.println("exception is:"+ex);
        }
    }
}

输出

Ms Paint will run.
You have exited from Ms paint.

示例 2

public class Process_waitForMethodExample2 {
    public static void main(String[] args) {
        try {
            // creating a new process.
            System.out.println("Ms Paint will run.");
            Process p1 = Runtime.getRuntime().exec("mspaint.exe");
            // waits for the process until you terminate.
            p1.waitFor();
            // when you manually close notepad.exe program will continue here
            System.out.println("You have exit from Ms-paint.");
            System.out.println("Notepad will run.");
            Process p2 = Runtime.getRuntime().exec("notepad.exe");
            // waits for the process until you terminate.
            p2.waitFor();
            // when you manually close notepad.exe program will continue here
            System.out.println("You have exited from Notepad.");

        } catch (Exception ex) {
            System.out.println("Oops! an error has occurred.");             }
    }
}

输出

Ms Paint will run.
You have exited from Ms-paint.
Notepad will run.
You have exited from Notepad.

示例 3

public class Process_waitForMethodExample3 {
    public static void main(String[] args) {

try{
    System.out.println("Both Ms paint and Notepad will run simultaneously.\n");
        System.out.println("1. Ms Paint will run.");
        Process p1 = Runtime.getRuntime().exec("mspaint.exe");
    System.out.println("2. Notepad will run.\n\n");
    Process p2 = Runtime.getRuntime().exec("notepad.exe");
        // waits for the process until you terminate.
        p1.waitFor();
        // when you manually close notepad.exe program will continue here
        System.out.println("You have exit from Ms-paint.");
    System.out.println("You have exited from Notepad.");
        p2.waitFor();
    } catch (Exception ex) {
        System.out.println("Oops! an error has occurred."); 
    }
   }
 }

输出

Both Ms paint and Notepad will run simultaneously.

1. Ms Paint will run.
2. Notepad will run.

You have exited from Ms-paint.
You have exited from Notepad.

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Java Process waitFor() 方法

语法

参数

返回

示例 1

示例 2

示例 3

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